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SRS Fault Code 900

posted by  someone claiming to be SJP on  Tue Mar 16 04:09 CST 2004 [RELATED]

We have a 1993 940NA. Turned it on this morning and the SRS light stayed on. Went to FAQs on the Board. Checked the codes as it discusses. Got a 1-1-2 code, "internal fault in the sensor unit."

Couple of questions.

First, the FAQ refers to a button on the "B" box. I have no button or light on the "B" box, only on the "A" box. But there are numbered slots on the "B" box, just like the "A" box. I followed the instructions and inserted the selector lead in the "B" box slot 5, but but used the "A" button and light. Hopefully this is the same, otherwise there is no way to check the "B" box codes.

Second, where is the sensor unit? Is it difficult to replace? How much does it cost? Any suggestions for parts suppliers with the best price?

Anyone have experiences with this?

Thanks,








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    SRS Fault Code 900

    posted by  spook on  Tue Mar 16 10:30 CST 2004
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    last visit: Fri Oct 24 08:06 CST 2014
    [RELATED]

    Dear SJP,

    Good p.m. and may this find you well. You read the fault code properly.

    I have the exact same car. The sensor unit is under the driver's seat.

    I will shortly have the Volvo Technical Manual that deals with these devices, and so be able to address replacing it.

    NOTE: BEFORE REMOVING THE SEAT AND/OR TOUCHING THE SENSOR, DISCONNECT THE NEGATIVE BATTERY CLAMP FROM THE BATTERY TERMINAL, AND PUT THE CLAMP IN A PLASTIC BAG. THIS PROTECTS AGAINST AN INADVERTENT TRIGGERING OF AN AIRBAG DEPLOYMENT, AS A RESULT OF THUMPING OR JOSTLING THE SENSOR. AN AIRBAG DEPLOYMENT AT CLOSE QUARTERS CAN BE DANGEROUS AND EXPENSIVE. A NEW AIRBAG UNIT IS ABOUT $1K.

    You might be able to get a sensor unit at a salvage yard. I have no idea what they'd charge for it. I'd only take such a unit if it came from a car with "low miles" and which had JUST arrived at the yard. If the car has been sitting out in the open, especially if the doors/windows are open, the sensor likely is ruined. While the seat will protect it from direct rainfall, water accumulating on the floor - or exposure to damp - could damage it pretty quickly.

    This is a life-saving part. I'd guess that a new replacement is only to be had from Volvo. It is not likely to be cheap.

    I'll be able to tell you more, when I get the Volvo Tech Manual (in a few days).

    Hope this helps.

    Yours faithfully,

    spook.








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      SRS Fault Code 900

      posted by  someone claiming to be 93-940 & 99-V70 (SJP) on  Tue Mar 16 13:31 CST 2004 [RELATED]

      Thanks for the info. I actually got the info from my Volvo service manager after I wrote the post. The crash sensor unit is indeed expensive, $1,229 (part only) at Volvo. Does not seem to be available anywhere else.

      The good news is that it probably is not the unit. I just had keyless remote installed this weekend. While they did a very neat job, they evidently cut into the steering column wiring harness for power, which Volvo tells me is a no-no. They said the sudden voltage draw by the locks probably caused the fault. If this is what caused it, the accessory shop that did the work will pay for it (I already spoke to them). I hope that is all it is, else $1,229 plus installation to fix. I would probably install it myself to save the 2 hours labor it would cost.

      Will let you know.








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        SRS Fault Code 900

        posted by  spook on  Wed Mar 17 00:43 CST 2004
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 08:06 CST 2014
        [RELATED]

        Dear SJP,

        Good a.m. and may this find you well. It would have been good to know that work had been done on the wiring.

        Might I suggest the following, to find out if the sensor is ruined? Remove the negative battery clamp from the terminal, and let the car sit for a couple of hours. Reconnect the battery clamp to the terminal, and see if the "fault" code is cleared and if the warning light is turned off.

        I am not familiar with the internals of these sensors, never having had one apart. However, the voltage variance caused by thelocks might have triggered an internal "circuit breaker" in the sensor. A cut-off of power might allow that "circuit breaker" to re-set.

        If that happens, you have saved yourself the time and trouble of getting a new sensor put in. If the fault remains, you can ask the shop to cover the cost of a new sensor, because it is clear that the sensor has been damaged beyond repair.

        I doubt anyone will repair one of these sensors. They are the heart of the airbag system, and there is no way to know if a repaired sensor will perform in a collision.

        I presume the shop that installed the keyless remote will find some other power source. Why they didn't run a wire directly from the fuse block is beyond me. That is relatively easy to do. If they don't know how to do this, consult my post of 8 January, regarding the installation of a power seat in a car that did not come so-equipped from the factory.

        Hope this helps.

        Yours faithfully,

        spook







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